Daniel Borkmann
87f947e2bb
bpf: Fix clobbering of r2 in bpf_gen_ld_abs ...
[ Upstream commit e6a18d36118bea3bf497c9df4d9988b6df120689 ]
Bryce reported that he saw the following with:
0: r6 = r1
1: r1 = 12
2: r0 = *(u16 *)skb[r1]
The xlated sequence was incorrectly clobbering r2 with pointer
value of r6 ...
0: (bf) r6 = r1
1: (b7) r1 = 12
2: (bf) r1 = r6
3: (bf) r2 = r1
4: (85) call bpf_skb_load_helper_16_no_cache#7692160
... and hence call to the load helper never succeeded given the
offset was too high. Fix it by reordering the load of r6 to r1.
Other than that the insn has similar calling convention than BPF
helpers, that is, r0 - r5 are scratch regs, so nothing else
affected after the insn.
Fixes: e0cea7ce98https://lore.kernel.org/bpf/cace836e4d07bb63b1a53e49c5dfb238a040c298.1599512096.git.daniel@iogearbox.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-10-01 13:14:52 +02:00
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bpf: Fix clobbering of r2 in bpf_gen_ld_abs
2020-10-01 13:14:52 +02:00
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cgroup, netclassid: remove double cond_resched
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net/page_pool: Fix inconsistent lock state warning
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net: sock_diag: Fix spectre v1 gadget in __sock_diag_cmd()
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tcp: make sure EPOLLOUT wont be missed
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2020-07-16 08:17:27 +02:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
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net/xdp: Fix suspicious RCU usage warning
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87f947e2bb